Over time, natural selection eliminates individuals with detrimental phenotypes

Question

Over time, natural selection eliminates individuals with detrimental phenotypes from a population, there are several individuals examples in the human population in which harmful genetic polymorphisms are maintained, Why? Individuals with two wild type alleles have advantages over individuals carrying the harmful allele. Individuals with two harmful alleles have advantages over individuals carrying one copy of the harmful allele. Homozygous individuals have some other advantage over individuals with two wild type alleles. Homozygous individuals have some other advantage over individuals with two wild type alleles.

Explanation / Answer

Heterozygous individual have some some other advantage over individual with two wild type of alleles. As in case of Sickle Cell anaemia.the homozygous indidual die in early ages of life while heterozygous individual can survive normally and they have superior character of Malaria resistance.

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